10 points for each of the following, give the full command (e.g. chmod 777 file.txt) needed to accomplish each goal. (a) (5) Change file.txt from -r--rw-rw-to -r-x------ with chmod using numeric notation. (b) (5) Change file.txt from -r-x------ to -rwxr-xr-x with chmod using symbolic notation. (c) Bonus - 2 points. Change file.txt from -r-x------ to -rwxr-xr-x with chmod using symbolic notation. Give a different answer than you gave for 5b